enhance dynamic flags & support sslCerts

[MegaByte875]

What type of PR is this?

• bug
• feature
• enhancement

What problem(s) does this PR solve?

Issue(s) number:

Description:

How do you solve it?

Special notes for your reviewer, ex. impact of this fix, design document, etc:

[MegaByte875]

sh-4.2# sh post-start-script 
+ :
+ curl -i -X PUT -H 'Content-Type: application/json' -d '{"prioritize_intra_zone_reading":"true","stick_to_intra_zone_on_failure":"true"}' -s http://10.244.4.233:19669/flags
HTTP/1.1 200 OK
Date: Thu, 21 Dec 2023 11:19:55 GMT
Connection: keep-alive
Content-Length: 18

{
  "errCode": 0
}+ '[' 0 -eq 0 ']'
+ break

[veezhang]

LGTM